CVE-2023-47539Network attack vector

Unauthenticated administrator login bypass via crafted request

Published Mar 18, 2025 · Updated Feb 26, 2026

Improper access control in Fortinet FortiMail 7.4.0 allows remote attackers to bypass administrator login via a crafted HTTP request. Fortinet has not published which request element or access-control operation incorrectly accepts the unauthenticated request. Exploitation requires RADIUS authentication with remote_wildcard enabled and grants administrative access without valid credentials.

CVSS severity9.8
Critical
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Fortinet FortiMail 7.4.0 allows remote attackers to bypass administrator login via a crafted HTTP request. Fortinet has not published which request element or access-control operation incorrectly accepts the unauthenticated request. Exploitation requires RADIUS authentication with remote_wildcard enabled and grants administrative access without valid credentials.

The record

CVE
CVE-2023-47539
Published
Mar 18, 2025
Updated
Feb 26, 2026
Vendor
Fortinet
Product
FortiMail
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fortinet · FortiMailversion=7.4.0

Published CVSS scores

9.8Fortinet, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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